[urgent] RFR: JDK-8145206: Configure broken on Macosx

[Tim Bell]

Erik:

> JDK-8036003 broke configure on Macosx:
>
> checking what type of native debug symbols to use... zipped
> configure: error: Unable to find objcopy, cannot enable native debug 
> symbols
>
> We can only fail for missing objcopy on platforms that actually use it.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8145206
> Webrev: http://cr.openjdk.java.net/~erikj/8145206/webrev.01/

Looks good to me.

Tim